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Hi there. You stated that you have a standalone computer and you are running Mac OS X so I will assume that you have an iMac. The iMacs have 3 USB ports on the back of the computer. They are located in the lower left if you are looking at the back of the iMac. In this picture, you can see the 3rd, 4th and 5th ports are all USB ports:

BeBoo, I had the start of Magic jack on the screen that is when I accepted, then when I left you I clicked on the spot, the response popped up, cannot open as the system does not support. Or something quite similar, can you help?

I am not familiar with MagicJacks, to be honest. I try to stay away from them. From what I've read, though, you need an Intel-based Mac to be able to use it which you do not have. You would need one of the newer Macs such as a Mac Pro, iMac, Macbook, etc.